Markush Claim

Covers a chemical compound with symbols replacing certain chemical groups. Various chemical groups, which can then be substituted for the symbols, are then listed. For example it could list C2H5R as the compound and then state that R can be either of chlorine, bromine, a hydroxyl group, etc. They can also be written as hardware claims or claims on products whose novelty lies in their ability to combine various items from a list, e.g., “a product which combines two or more of the following features: a, b, c, d …”

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